Question

I will give you the Brainly points

Answer 1

17.

First calculate the cost of DVD,

$20-9.89=10.11$

Then reduce it by 7.5%.

$10.11-10.11\cdot0.075\approx\boxed{9.35}$

18.

Average is,

$a=\displaystyle\Sigma_{i=1}^{n}\dfrac{a_i}{n}\Longrightarrow\dfrac{1}{n}\Sigma_{i=1}^{n}a_i$

We know that n = 30 and,

$\Sigma_{i=1}^{30}a_i=3865.5$

Hence,

$a=\dfrac{3865.5}{30}=\boxed{128.85}$

19.

So 2% of some number is 4586,

$x\cdot0.02=4586$

Solve for x.

$x=\dfrac{4586}{0.02}=\boxed{229300}$

Hope this helps.

r3t40

Answer 2

Answer:

Hope This Helps Bub

Step-by-step explanation:

17.

First calculate the cost of DVD,

Then reduce it by 7.5%.

18.

Average is,

We know that n = 30 and,

Hence,

19.

So 2% of some number is 4586,

Solve for x.

Hope this helps.

r3t40